HttpWebRequest

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  public string GetPageByHttpWebRequest(string url, Encoding encoding, string strRefer)
        {

            string result = null;
   
            WebResponse response = null;
            StreamReader reader = null;

            try
            {
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
                request.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727)";
                request.Accept = "image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*";

                if (!string.IsNullOrEmpty(strRefer))
                {
                    Uri u = new Uri(strRefer);
                    request.Referer = u.Host;
                }
                else
                {
                    request.Referer = strRefer;
                }
                request.Method = "GET";
                response = request.GetResponse();
                reader = new StreamReader(response.GetResponseStream(), encoding);
                result = reader.ReadToEnd();
                
            }
            catch (Exception ex)
            {
                result = "";
            }
            finally
            {
                if (reader != null)
                    reader.Close();
                if (response != null)
                    response.Close();
                
            }
            return result;
        }

HttpWebRequest

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原文地址：http://www.cnblogs.com/i-hqq/p/4629948.html